An equivalent linear (EL) modal for the dynamic analyses of high-speed railway seismic isolated bridges (HSRSIB) with isolator is established in this paper,the calculation method of dynamic parameters of the isolator is presented based on the model.the spatial analysis model of a vehicle-bridge system is developed,the vehicle-track-bridge (VTB) element is derived to simulate the interaction of train and bridge,in which the moving trains are modeled as a series of sprung masses,the rail random irregularity is considered,the dynamic responses of the non-isolated and isolated bridge under the earthquake load combination of the horizontal and vertical directions are calculated,and seismic isolation effect of isolator is analyzed.The numerical calculation results indicate that,the isolator have excellent performance in seismic isolation and energy dissipation,the bending moment and shear force of pier bottom of bridge can be effectively decreased,and the displacement of girder and bearings are not greatly increased.